package com.hmdp.utils;

import org.springframework.core.io.ClassPathResource;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.core.script.DefaultRedisScript;

import javax.annotation.Resource;
import java.util.Collections;
import java.util.UUID;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Lock;

public class SimpleRedisLock implements ILock {
    private static final  String ID_PREFIX= UUID.randomUUID().toString()+"-";
    private static final String KEY_PREFIX="lock";
    private String name;
    private static final DefaultRedisScript<Long> UNLOCK_SCRIPT;
    static {
       UNLOCK_SCRIPT=new DefaultRedisScript<>();
       UNLOCK_SCRIPT.setLocation(new ClassPathResource("unlock.lua"));
       UNLOCK_SCRIPT.setResultType(Long.class);

    }
    @Resource
    private StringRedisTemplate stringRedisTemplate;
    public SimpleRedisLock(String name, StringRedisTemplate stringRedisTemplate) {
        this.name = name;
        this.stringRedisTemplate = stringRedisTemplate;
    }

    @Override
    public boolean tryLock(long timeoutSec){
        String threadId=ID_PREFIX+ Thread.currentThread().getId();
        Boolean success=stringRedisTemplate.opsForValue().setIfAbsent(KEY_PREFIX+name,threadId+"",timeoutSec, TimeUnit.SECONDS);
        return Boolean.TRUE.equals(success);


    }

//    @Override
//    public void unlock(){
//        stringRedisTemplate.execute(UNLOCK_SCRIPT, Collections.singletonList(KEY_PREFIX+name),ID_PREFIX+Thread.currentThread().getId());
//
//    }
    @Override
    public void unlock() {
        String threadId=ID_PREFIX+Thread.currentThread().getId();
        String id=stringRedisTemplate.opsForValue().get(KEY_PREFIX+name);
        if(threadId.equals(id)){
            stringRedisTemplate.delete(KEY_PREFIX+name);
        }

    }
}
